= Nicolas Léonard Sadi Carnot
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= Sadi Carnot
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<Sadi Carnot> investigated what limits the <work> obtainable by transferring <heat> between hot and cold bodies. His reversible-engine argument compares machines without tying the ideal performance to a particular working substance. A reversible reference cycle can run backward, so a supposedly better engine could be combined with it to produce an impossible net result. This reasoning underlies <Carnot's theorem> and the modern bound $\eta\leq1-T_c/T_h$ for reservoirs at absolute <temperatures> $T_h>T_c$. The <temperature> notation is modern, rather than Carnot's original formulation.<Réflexions sur la puissance motrice du feu et sur les machines propres à développer cette puissance by Sadi Carnot>[1824 treatise, reversible-engine comparison and independence from working substance]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Sadi_Carnot.jpeg?width=260]
{title=Portrait of <Nicolas Léonard Sadi Carnot>}
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